#include <stdio.h>
/* print Fahrenheit-Celsius table
 * for fahr = 0, 20, ..., 300 */
#define LOWER 0
#define UPPER 300
#define STEP 20

int main()
{
    printf("  F    C\n");
    float fahr;
    for(fahr=LOWER;fahr<=UPPER;fahr+=STEP){
        printf("%3.0f %6.1f\n",fahr,(fahr-32))*5.0/9;
    }
}
